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I think you can use a hashmap: <String, ArrayList<Integer>> and a trie. The hashmap is used to store the word and the page numbers in increasing order. The trie is used for storing all words in alphabetical order.
- crazyguy April 25, 2013Whenever you find a new word or an existing word in the hashmap, insert or put the word in the hashmap and append the page number arraylist. Meanwhile, insert the word in the trie if it's not there.